Add vertical RadioGroup demo, close #1119

components/radio/demo/radiogroup-more.md

+# RadioGroup 垂直
+
+- order: 2
+
+垂直的 RadioGroup，配合更多输入框选项。
+
+---
+
+````jsx
+import { Radio, Input } from 'antd';
+const RadioGroup = Radio.Group;
+
+const App = React.createClass({
+  getInitialState() {
+    return {
+      value: 1,
+    };
+  },
+  onChange(e) {
+    console.log('radio checked', e.target.value);
+    this.setState({
+      value: e.target.value,
+    });
+  },
+  render() {
+    const radioStyle = {
+      display: 'block',
+      height: '30px',
+      lineHeight: '30px',
+    };
+    return (
+      <RadioGroup onChange={this.onChange} value={this.state.value}>
+        <Radio style={radioStyle} key="a" value={1}>Option A</Radio>
+        <Radio style={radioStyle} key="b" value={2}>Option B</Radio>
+        <Radio style={radioStyle} key="c" value={3}>Option C</Radio>
+        <Radio style={radioStyle} key="d" value={4}>
+          More...
+          {this.state.value === 4 ? <Input style={{ width: 100, marginLeft: 10 }} /> : null}
+        </Radio>
+      </RadioGroup>
+    );
+  }
+});
+
+ReactDOM.render(<App />, mountNode);
+````

components/radio/group.jsx

@@ -83,6 +83,6 @@ export default React.createClass({
       [props.prefixCls]: true,
       [`${props.prefixCls}-${props.size}`]: props.size,
     });
-    return <div className={classString}>{children}</div>;
+    return <div className={classString} style={props.style}>{children}</div>;
   },
 });